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| 型号： | LM2795TLX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT BCKLT 14USMD |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 325kHz ~ 515kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFBGA |
| 供应商设备封装： | 14-TuSMD |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
| 配用： | LM2795EVAL-ND - BOARD EVALUATION LM2795 |
| 其它名称： | LM2795TLX |
SNVS168L – JANUARY 2002 – REVISED MAY 2013
POWER DISSIPATION
The power dissipation (P DISSIPATION ) and junction temperature (T J ) can be approximated with the equations
below. P IN is the power generated by the 1.5x charge pump, P LED is the power consumed by the LEDs, P POUT is
the power provided through the P OUT pin, T A is the ambient temperature, and θ JA is the junction-to-ambient
thermal resistance for the DSBGA package. V IN is the input voltage to the LM2794/5, V DX is the LED forward
voltage, I DX is the programmed LED current, and I POUT is the current drawn through P OUT .
P DISSIPATION = P IN - P LED ? P POUT
= [1.5×V IN ×(4I DX + I POUT )] ? (V DX ×4I DX ) ? (1.5×V IN ×I POUT )
T J = T A + (P DISSIPATION × θ JA )
(13)
(14)
(15)
The junction temperature rating takes precedence over the ambient temperature rating. The LM2794/5 may be
operated outside the ambient temperature rating, so long as the junction temperature of the device does not
exceed the maximum operating rating of 100°C. The maximum ambient temperature rating must be derated in
applications where high power dissipation and/or poor thermal resistance causes the junction temperature to
exceed 100°C.
DSBGA MOUNTING
The LM2794/5 is a 14-bump DSBGA with a bump size of 300 micron diameter. The DSBGA package requires
specific mounting techniques detailed in Application Note (AN -1112 SNVA009 ). NSMD (non-solder mask
defined) layout pattern is recommended over the SMD (solder mask defined) since the NSMD requires larger
solder mask openings over the pad size as opposed to the SMD. This reduces stress on the PCB and prevents
possible cracking at the solder joint. For best results during assembly, alignment ordinals on the PC board should
be used to facilitate placement of the DSBGA device. DSBGA is a wafer level chip size package, which means
the dimensions of the package are equal to the die size. As such, the DSBGA package lacks the plastic
encapsulation characteristics of the larger devices and is sensitive to direct exposure to light sources such as
infrared, halogen, and sun light. The wavelengths of these light sources may cause unpredictable operation.
Copyright ? 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2794 LM2795
17
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| LM27961TL/NOPB | 功能描述:IC LED DRVR WHT BCKLT 18USMD RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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